git.y1.nz

commit 10801af8e3d633bbc097b7ca8e6a9994c32b33d4
parent 69ed0fcf9c2bbb2ac84226ecea49d45fcf6af33a
Author: Lior Halphon <LIJI32@gmail.com>
Date:   Thu, 16 Oct 2025 00:23:28 +0300

Fix PCM34 read accuracy on CGB-C and older

Diffstat:
M
Core/apu.c
4
++--

1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Core/apu.c b/Core/apu.c
@@ -568,7 +568,7 @@ static void tick_noise_envelope(GB_gameboy_t *gb)
     if (!(nr42 & 7)) return;
 
     if (gb->cgb_double_speed) {
-        gb->apu.pcm_mask[0] &= (gb->apu.noise_channel.current_volume << 4) | (gb->model == GB_MODEL_CGB_0? 0x3F : 0x1F);
+        gb->apu.pcm_mask[1] &= (gb->apu.noise_channel.current_volume << 4) | 0x1F;
     }
     
     if (nr42 & 8) {
@@ -1023,7 +1023,7 @@ restart:;
 
                 /* Step LFSR */
                 if (new_bit && !old_bit) {
-                    if (cycles_left == 0 && gb->apu.samples[GB_NOISE] == 0) {
+                    if (cycles_left == 0 && gb->apu.samples[GB_NOISE] == 0 && !gb->cgb_double_speed) {
                         gb->apu.pcm_mask[1] &= 0x0F;
                     }
                     step_lfsr(gb, cycles - cycles_left);

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